Quantum nondemolition measurement of spin via the paramagnetic Faraday rotation

Takahashi, Yoshiro; Honda, K.; Tanaka, N.; Toyoda, K.; Ishikawa, Kiyoshi; Yabuzaki, T.

doi:10.1103/physreva.60.4974

Cited by 154 publications

(166 citation statements)

References 25 publications

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“…ThisĴ zŜz -type interaction has direct relevance to experimental situations in Refs. [19,20,21,22,11]. The interaction between the system and the probe gives rise to a unitary transformation,…”

Section: Reversible Spin Measurementmentioning

confidence: 99%

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Reversible quantum measurement with arbitrary spins

Terashima

Ueda

2006

Phys. Rev. A

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We propose a physically reversible quantum measurement of an arbitrary spin-s system using a spin-j probe via an Ising interaction. In the case of a spin-1/2 system (s = 1/2), we explicitly construct a reversing measurement and evaluate the degree of reversibility in terms of fidelity. The recovery of the measured state is pronounced when the probe has a high spin (j > 1/2), because the fidelity changes drastically during the reversible measurement and the reversing measurement. We also show that the reversing measurement scheme for a spin-1/2 system can serve as an experimentally feasible approximate reversing measurement for a high-spin system (s > 1/2). If the interaction is sufficiently weak, the reversing measurement can recover a cat state almost deterministically in spite of there being a large fidelity change.

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Section: Reversible Spin Measurementmentioning

confidence: 99%

“…In order to prepare the state (84), we here use the scheme in Ref. [21], which was originally proposed to realize a squeezed spin state [23]. The system is first prepared in the state…”

Section: Two-dimensional Subspace Modelmentioning

confidence: 99%

Reversible quantum measurement with arbitrary spins

Terashima

Ueda

2006

Phys. Rev. A

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“…⋆ Fax:+81-75-753-3769, E-mail:yitk@scphys.kyoto-u.ac.jp Recently, there has been a renewal of interest in the paramagnetic Faraday rotation as quantum non-demolition measurement of spin (spin QND) [3,4,5]. Spin QND is not only a quantum measurement, but also has a wide variety of the applications.…”

Section: Introductionmentioning

confidence: 99%

“…where α is a real constant, t 1 is the intreaction time, and S z is the total spin component in the probe region parallel to the propagation direction of light [3].…”

Section: Introductionmentioning

confidence: 99%

Paramagnetic Faraday rotation with spin-polarized ytterbium atoms

et al. 2006

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We report observation of the paramagnetic Faraday rotation of spin-polarized ytterbium (Yb) atoms. As the atomic samples, we used an atomic beam, released atoms from a magneto-optical trap (MOT), and trapped atoms in a far-off-resonant trap (FORT). Since Yb is diamagnetic and includes a spin-1/2 isotope, it is an ideal sample for the spin physics, such as quantum non-demolition measurement of spin (spin QND), for example. From the results of the rotation angle, we confirmed that the atoms were almost perfectly polarized.

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“…To measure the quantum nature of the atomic ensembles, one of the most useful interaction is paramagnetic Faraday rotation of light [1]. Under some conditions, the probing of the atomic ensembles via the paramagnetic Faraday rotation with a polarimeter becomes quantum non-demolition measurement of spin (spin QND) [2,3,4].…”

Section: Introductionmentioning

confidence: 99%

Fast polarimetry system for the application to spin quantum non-demolition measurement

et al. 2006

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We report the development of a fast pulse polarimeter for the application to quantum non-demolition measurement of atomic spin (Spin QND). The developed system was tunable to the atomic resonance of ytterbium atom and has narrow laser linewidth suitable for spin QND. Using the developed polarimeter, we successfully demonstrated the measurement of the vacuum noise, with 10 6 to 10 7 photon number per pulse.

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Quantum nondemolition measurement of spin via the paramagnetic Faraday rotation

Cited by 154 publications

References 25 publications

Reversible quantum measurement with arbitrary spins

Reversible quantum measurement with arbitrary spins

Paramagnetic Faraday rotation with spin-polarized ytterbium atoms

Fast polarimetry system for the application to spin quantum non-demolition measurement

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